Note: Descriptions are shown in the official language in which they were submitted.
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- ~ The present invention relates to improvements in
stoppers for screwed necks and more particularly to a stop-
per of this type comprising a capsule whose inner part is
associated with a seal.
Such a stopper must ensure an excellent tiahtness and
`' must hold well under pressure on bottles having to be sub-
jected to different heat treatments, such as pasteurisation
or even sterilisation in certain extreme cases.
The stoppers in question are provided to be used on
returnable bottles of which the d:imensi~o~ns of the bore of the
neck have considerable tolerancesl in ~r*Fr words, the value
`~^J~ of this diameter varies within large proportions. The shape
of tlle edye, i.e. tlle outer ~drt ol tl~e neck, of the bottles
in ~uestion may also vary considerably.
~` 15 Presently used stoppers generally do not give satis-
faction to consumers, whether they are made in one piece or
composed of two elements.
It is an object of the improvements forming the subject
matter of the present invention to provide a two-piece stopper
composed of a rigid capsule and a moulded seal fixecl inside
said capsule, and which presents a supple lip adapted to be
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96
turned back against the further end of the capsule, this
seal being fixed by means of an elas-tic funnel which the
seal covers so that tightness is effected by intimate
contact with the interior, the outside and the top of the
neck.
In accordance with the present invention there is
:- provided a stopper to be secured to the neck of a bottle
having a transverse face across the outer end of the neck
and having an axial bore extending inwardly of the neck
through the face, the stopper comprising: a) a capsule
having a skirt for surrounding and gripping the neck, and having
a closed end with an annular face overlying the transverse
face and including a central part overlying the bore and part
of the transverse face and offset axially outwardly from the
neck and beyond the annular face, and having a tubular funnel
extending inwardly from the central part and converging from
a larger diameter at the central part to a smaller diameter
edge .insertable in ~he bore, and b) a supple seal comprising
a dish portion shaped to fit in the funnel:and be retained
thereby, and an annular lip portion extending from the dish
portion and reversible to turn back about the smaller diameter
edge of the funnel to lie a~ainst the annular face and extend
into contact with and part-way along the inner periphery
of the skirt when the stopper is secured to the neck.
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The invention will be more readily understood on
reading the following description with reference to the
accompanying drawings, in which:
Fig. 1 is an exploded view showing the two elements
of a stopper according to the invention.
~ ig. 2 is a section of the stopper in ~uestion
before it is placed in position.
Fig. 3 is a view similar to Fig. 2, but illustrating
the stopper once it is screwed on the neck of a bottle.
Referring now to the drawings, Fig. 1 shows a
stopper according to the invention comprising a capsule 1 and
a seal 2 made respectively of polypropylene and ethylene-
vinyl-acetate (EVA).
The capsule 1 comprises an end la of which the central
part lb is offset outwardly so as to constitute in the
capsule a depression lc. In known manner, the inner face
of the skirt ld of the capsule is provided with a thread le.
A tubular funnel lf is connected with the central offset
part lb of the end i.e. its origin is in the depression lc
and at the level of its junction with the end la. This
funnel is provided to be conical with downwardly directed
opening, its free edge lg being slightly flared out in the
direction of the skirt ld. It is therefore observed that
the height of the funnel is clearly increased with respect
to that of a similar element starting from the end la. Thus,
the funnel has a considerable radial suppleness at seal
level.
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-- 2 --
496
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The seal 2 is made in the form of a dish 2a of which
the free edge of its side wall extends in a truncated lip
2b open in the direc-tion opposite that of the dish 2a.
Due to the suppleness Or Lhe ma~crial constituting
5 the seal 2, and further to the elasticity of the funnel lf,
the dish 2a may easily be engaged inside this funnel aschown
in Figs. 2 and 3. The cylindrical wall of said dish then
deforms to cooperate with the undercut inner face of the
funnel lf.
With the aid of a tubular punch (not shown), the lip
2b may easily be turned back so that its edge is applied
against the annular face lh of the end of the capsule which
surrounds the depression lc. It will be observed that the
edge of the lip 2b turns back against said face lh and also
against the upper part of the inner face of the skirt ld.
When the stopper is placecl in position on the neck 3
of a bottle, the capsule ~ is clisplclcecl axially as its thread
le cooperates Witil the thread 3a of the neck. This displace-
ment causes the tubular funnel lf to enter the bore 3b of
o the neck 3 so that the corresponding part of the lip ~b of
the seal 2 is elastically applied against the opening of this
bore. In addition, the face lh of the capsule tightens
- another part of the lip of the seal 2 against the end 3c of
` the neck. Finally, the action of the capsule produces a
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~5 gripping of th~ edge of the lip between the interior of the
skirt of the capsule 1 and the periphery of the neck 3 (Fig.
3)-
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Thus, when the necks have bores of very different dia-
meters and variously shapecl outer faces, an excellent tight-
ness is obtained as the funnel lf always applies part of the
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seal elastically against the boresin question and this sealwill be crushed against the face 3c of the neck 3 and . -
against its periphery. A good tightness is also obtained
even if the glass is chipped.
When the stopper is removed from the neck 3, the
seal conserves the shape given it when first screwed so that
a stopper iSObtairled comprising an inner seal of the type
such as obtained by casting a plastic material compound on
i.ts end.
